Recommended for beginnersHere is a shortlist of links recommended for beginners.

Everything in the section Language creation, grammar, syntax and vocabulary, and especially the Language Construction Kit: http://www.zompist.com/kit.html - a "manual" for creating (naturalistic) languages. A similar website is also Wikibook: Conlanghttps://en.wikibooks.org/wiki/Conlang - it's more of a step-by-step tutorial at various levels but really useful for beginners.

Campaign Cartographer 3 (software, tree demo): https://secure.profantasy.com/default.asp - a powerful map generator. There site includes other conworlding tools, such as Dungeon Designer, City Designer, Fractal Terrains, and Cosmographer.